- Boost-users - lists.boost.org

Finding several Files
by German Escallon 11 Jun '08

11 Jun '08

Hello All, I am trying to figure out the path to several files w/ the same name inside a certain directory structure. I was thinking of using the find_file() function from the filesystem library (see below). Unfortunately, the function stops when the first match is encountered. Is there a better way and/or alternative?? Thanks. ~G bool find_file( const path & dir_path, // in this directory, const std::string & file_name, // search for this name, path & path_found ) // placing path here if found { if ( !exists( dir_path ) ) return false; directory_iterator end_itr; // default construction yields past-the-end for ( directory_iterator itr( dir_path ); itr != end_itr; ++itr ) { if ( is_directory(itr->status()) ) { if ( find_file( itr->path(), file_name, path_found ) ) return true; } else if ( itr->leaf() == file_name ) // see below { path_found = itr->path(); return true; } } return false; } ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________

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[bjam, binary compatibility] --layout=system and copying of binaries; different compiler versions
by Christoph Duelli 11 Jun '08

11 Jun '08

Following scenario: I have two machines M_a and M_b. M_a is running gcc4.1, M_b is running gcc4.2. Both have the same Boost Libs (1.35) compiled -with identical options- and installed (with their resp. gcc). I have used bjam option --layout=system. The Boost libs do therefore *not* have gcc41 or gcc42 in their names. Thus, the names are the same on both machines... which leads me to the following question: May I copy binaries (that link against Boost.Regex, Boost.FileSystem etc) from M_a to M_b? (or vice versa) The linker is happy as the libs required are there, but will it really work? Is this an *evil* thing to do? Best regards Christoph

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[boost-users] Build boost libraries (e.g. filesystem) with gcc and -m32
by Andreas Profous 11 Jun '08

11 Jun '08

Hi all, I'm working on Intel Core2 Duo machine running Linux and have the following problem: I want to compile 32-bit versions of the boost libs with gcc, so that I can link and create 32bit programs. Unfortunately if I use bjam --toolset=gcc stage the libraries are built as 64bit libraries so if I link I get the following error: >g++ filesystem_test.cpp -g -m32 -c -o filesystem_test.o -L../boost/boost_1_35_0/stage/lib -I../boost/boost_1_35_0 >g++ filesystem_test.o -L../boost/boost_1_35_0/stage/lib -m32 -o filesystem_test -lboost_filesystem-gcc41-mt /usr/bin/ld: skipping incompatible .../boost/boost_1_35_0/stage/lib/libboost_filesystem-gcc41-mt.so when searching for -lboost_filesystem-gcc41-mt If I omit -m32 everything works fine. Help is very much appreciated, Andreas

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Re: [Boost-users] boost filesystems and case issues
by brad＠16systems.com 11 Jun '08

11 Jun '08

I tried this. It seems to work. int lower_case(int c) { return tolower(c); } ... ... ... if (boost::filesystem::is_regular(itr->path())) { path = itr->path(); lpath = path.string(); transform(lpath.begin(), lpath.end(), lpath.begin(), lower_case); std::cout << path << std::endl; std::cout << lpath << std::endl; }

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Re: [Boost-users] [math/special_functions] newbie question: compiler error with factorial
by Sakaie, Ken 11 Jun '08

11 Jun '08

Thank you Steven and John for the fixes, explanation, and fast reply! =================================== P Please consider the environment before printing this e-mail Cleveland Clinic is ranked one of the top hospitals in America by U.S. News & World Report (2007). Visit us online at http://www.clevelandclinic.org for a complete listing of our services, staff and locations. Confidentiality Note: This message is intended for use only by the individual or entity to which it is addressed and may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and destroy the material in its entirety, whether electronic or hard copy. Thank you.

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program_options: emit usage message on unknown option ?
by Stephen Collyer 11 Jun '08

11 Jun '08

Is it possible to have boost::program_options emit a usage message when an unknown option is supplied ? I have code which is parsing its options like this: > void UserAPI::parse_options(const std::vector<std::string>& required_options, > int argc, char* argv[], > std::string usage) > { > po::store(po::parse_command_line(argc, argv, options_desc_, options_style_), vm_); > po::notify(vm_); > > // count how many required options we have > > uint count = 0; > for (std::vector<std::string>::const_iterator s = required_options.begin(); > s != required_options.end(); ++s) > { > count += vm_.count(*s); > } > > // if we have a help option, or we don't have all the required options > // emit the usage message > > if ( vm_.count("help") || count != required_options.size() > ) > { > std::cout << usage << std::endl; > std::cout << options_desc_ << std::endl; > exit(1); > } > } If I pass an unknown option, it seems to be handled automagically: > install/linux/general -orgid ABC -p fred > unknown option -p I don't want this - I want to catch it somehow and emit my usage message, but this seems not to be documented, AFAICS. Anyone know how this can be done ? -- Regards Steve Collyer Netspinner Ltd

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shared_ptr and multi_set
by Robert Kubrick 11 Jun '08

11 Jun '08

I am having a memory error when accessing a shared_ptr in a multi_set collection. I caught this comment in the shared_ptr documentation: int main() { std::vector<FooPtr> foo_vector; std::set<FooPtr,FooPtrOps> foo_set; // NOT multiset! ... http://www.boost.org/doc/libs/1_35_0/libs/smart_ptr/example/ shared_ptr_example.cpp So I guess shared_ptr in multi_set are not supported?

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[math/special_functions] newbie question
by Sakaie, Ken 11 Jun '08

11 Jun '08

I did the following 'hello-world'-level test of the factorial function and get the following error. > cat test.cpp #include "boost/math/special_functions/factorials.hpp" int main() { unsigned int i = 6; printf("%d\n", boost::math::factorial(i)); } > g++ -I/home/sakaiek/ext/src/boost_1_35_0/ test.cpp test.cpp: In function int main(): test.cpp:5: error: no matching function for call to factorial(unsigned int&) I think I set up the include directory correctly: > ls /home/sakaiek/ext/src/boost_1_35_0/boost/math/special_functions acosh.hpp beta.hpp detail ellint_3.hpp ellint_rj.hpp fpclassify.hpp laguerre.hpp math_fwd.hpp sinhc.hpp asinh.hpp binomial.hpp digamma.hpp ellint_rc.hpp erf.hpp gamma.hpp lanczos.hpp powm1.hpp sin_pi.hpp atanh.hpp cbrt.hpp ellint_1.hpp ellint_rd.hpp expm1.hpp hermite.hpp legendre.hpp sign.hpp spherical_harmonic.hpp bessel.hpp cos_pi.hpp ellint_2.hpp ellint_rf.hpp factorials.hpp hypot.hpp log1p.hpp sinc.hpp sqrt1pm1.hpp Any help would be greatly appreciated. Thanks! =================================== P Please consider the environment before printing this e-mail Cleveland Clinic is ranked one of the top hospitals in America by U.S. News & World Report (2007). Visit us online at http://www.clevelandclinic.org for a complete listing of our services, staff and locations. Confidentiality Note: This message is intended for use only by the individual or entity to which it is addressed and may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and destroy the material in its entirety, whether electronic or hard copy. Thank you.

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Re: [Boost-users] Serialization triggers .lib and .exp file generationin VS2005
by spock＠snafu.de 11 Jun '08

11 Jun '08

Robert Ramey wrote: > Thomas Voigt wrote: >> Robert Ramey schrieb: >>> This is a side effect of the steps taken inhibit the compiler from >>> eliminationg code not explicitly referred to. (aka code stripping). >> >> So is there a way around it? Since we use boost in a rather controlled >> environment (only VS2005) we could patch it locally. > > well, we wouldn't put it in there if there was an easy way around it. Sure :-) > You could comment out all the _export keywords in the code. But > its doubtful that serialization of pointers could be made to work. Could you elaborate what the problem is exactly? We don't want to serialize pointers, at least not at the moment. Regards, Thomas

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Using boost file memory mapping (managed_mapped_file) with a vector
by Henry 11 Jun '08

11 Jun '08

I am trying to use a vector with a managed_mapped_file. http://www.boost.org/doc/libs/1_35_0/doc/html/boost/interprocess/vector.html seems to indicate this can be done. When I try to run the code below, it fails with a "bus error" (on OS X) after printing "Entering item in vector". What am I doing wrong? Also, how can I grow this managed_mapped_file as I add things to the vector? I get runtime errors using the managed_mapped_file::grow() function. The code below should just fill up a vector with powers of 2, and print it. I am trying to understand the library before I implement it for something real. Code below: #include <boost/interprocess/file_mapping.hpp> #include <boost/interprocess/mapped_region.hpp> #include <boost/interprocess/containers/vector.hpp> #include <boost/interprocess/managed_mapped_file.hpp> #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/containers/vector.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <iostream> #include <fstream> #include <cstring> #include <cstddef> #include <cstdio> #include <cmath> int main () { using namespace boost::interprocess; try{ std::cout << "Starting" << std::endl; managed_mapped_file mfile (open_or_create, "MyMappedFile", 65536); std::cout << "Mapped file" << std::endl; typedef allocator<int, managed_shared_memory::segment_manager> ShmemAllocator; typedef vector<int, ShmemAllocator> MyVector; const ShmemAllocator alloc_inst (mfile.get_segment_manager()); std::cout << "Making vector" << std::endl; MyVector* vec = mfile.construct<MyVector>("vec")(alloc_inst); std::cout << "Made vector" << std::endl; std::cout << "Filling vector" << std::endl; int i = 0; for(i = 0; i < 63; ++i) { std::cout << "Entering item in vector" << std::endl; vec->push_back(pow(2,i)); std::cout << "Entered item in vector" << std::endl; } std::cout << "Filled vector" << std::endl; std::cout << "Size of vec is:\t" << vec->size() << std::endl; std::cout << "Reverse printing contents of vector" << std::endl; for(i = vec->size()-1; i >= 0; --i) { std::cout << "At " << i << ":\t" << vec->at(i) << std::endl; } std::cout << "Printed contents of vector" << std::endl; } catch(interprocess_exception &ex){ std::remove("MyMappedFile"); std::cout << ex.what() << std::endl; return 1; } std::remove("MyMappedFile"); return 0; }

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